• synonyms


[fach-oo-uh s]
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  1. foolish or inane, especially in an unconscious, complacent manner; silly.
  2. unreal; illusory.
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Origin of fatuous

1625–35; < Latin fatuus silly, foolish, idiotic; see -ous
Related formsfat·u·ous·ly, adverbfat·u·ous·ness, noun


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1. dense, dull, dim-witted. See foolish.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for fatuous


  1. complacently or inanely foolish
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Derived Formsfatuously, adverbfatuousness, noun

Word Origin

C17: from Latin fatuus; related to fatiscere to gape
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for fatuous


c.1600, from Latin fatuus "foolish, insipid, silly;" of uncertain origin (Buck suggests originally "stricken" in the head). Related: Fatuously; fatuousness.

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Online Etymology Dictionary, © 2010 Douglas Harper